wow...
just saw this and open'd the last page first...
Lets use a real car that has been to a real dyno and a real dragstrip... not my uncles buddies car that was desktop'd and g-manipulated.
with 48,000 on the clock, stock mam bored to 62mm's, and an off road H...
218rwhp/276rwtq.
the car ran 13.2's at the track (sea level) with 235/60-15 d/r's and 3.73's.
You can believe it was dialed in... no new plugs and wires were gonna add a mystical bunch of power.
with less than 50,000 on the clock, long tube headers, 2-1/2" off road H pipe, 2-1/2" cat back, and a 76mm MAM...
234rwhp/292rwhp.
the car ran 12.96 at the track (2600 d/a.), now sporting 4.10's, ET Streets and ET Fronts... again, all the tuning details had been worked out, to the point that custom chip tuner told me there was no improving on the current tune with a chip.
Now, these numbers seem to be out of the ordinary in that not many folks are achieving that level of power or performance from thier 'stock' long blocks.
I find it very very difficult to believe anyone is making 260rwhp out of an untouched stock long block.
'93 Cobra did have better heads/intake, but also sported a less aggressive cam, and wore just about evey option in the book.
my guess is that added hp from the gt40 heads, cobra intake would soon be made invisible at the track if matched up to an '87 sd coupe with nothing but a radio for options.